Thirukkural

ஒல்வ தறிவது அறிந்ததன் கண்தங்கிச் செல்வார்க்குச் செல்லாதது இல்.

Olva Tharivadhu Arindhadhan Kandhangich Chelvaarkkuch Chellaadhadhu Il

There is nothing which may not be accomplished by those who, before they attack (an enemy), make themselves acquainted with their own ability, and with whatever else is (needful) to be known, and